Gear-grinding machine.



M. E, NOYES. GEAR GRINDING MACHINE. APPLICATION FILED DEC. 1. 191's.

Patented July 11, 1916.

5 SHEETS-SHEET I ATTORNEY.

M m H W M. E. NOYES. GEARGRINDING MACHINE.

APPLICATION FILED DEC. l, 1913.

1,191,093." PatentedJulyll, 1916.

5 SHEETSSHEET 2.

ATTORNEY. I

NI. E. NOYES. GEAR GRINDING MACHINE. APPLICATIQN F lLED DEC. 1. i913.

' 1 1 9 1,093. Patented July 11, 1916.

5 SHEETS-SHEET 3 Z 3. 93 3,4, Mb fle M. E. mugs. GEAR GRINDING MACHINE.

APPLICATION FILED DEC-1. 1913.

ATTORNEY.

p is

k UNITED STATES PAT 'MAYHEW E. NOYES, OF

cLEwE ANnoHIo, ASSIGNOR 130 THE oHIo GEAR GninniNG COMPANY, A CORPORATION OF oHIo.

GEAR-GRINDING MACHINE.

' To all whom it may concern I Be it known thatI, MAyi-inw 'citizenof the United States, residing at Cleveland, county of Guyahoga, State of 5 Ohio, have invented a certain new and use- This invention "relates to gear grinding machines and has for itsuobject a simple and eflicient device for successively grin'din the. teeth of a gear blank to conforni perfectly to the contour line upon. which they have been laidout and caster cut o fthe. blank; may be ground exactly to, the sa'me size andform, to accomplish which a templet, having theface contour ofa finished gear tooth, is utilized to determine the path of movenientof-the tooth of theblank in its engagement with the grinding wheel.

A. further object resides in the means whereby the engagement of the templet with a finder rolls the gearduring the time the tooth is in engagement with the grinding wheel, and another object resides in the meaiisutilized in indexing the gear wheel whereby the teeth thereof are operated upon in succession. I

Another object resides in the means whereby gears of variousdiameters may be operated upon with equal facility.

the accompanying .drawingsin which% i v Figure] is a sideelevation of. a grinding machine en'ibodying my invention. Fig. 2

i ,i i o "*eion on line ;l/; of 1, show ng the mechan sm for Ioperatingtlie slide carrying the gear blank tobe:operated upon and a portion oftheindexing merhanism. Fig. --i is a section on line-li -Ti oi Fig. 3. Fig. 5

is a section taken on line I -ll; (if-Fig. 2.

Fig. (l is a detail of the mechanism con trolled by the mo\-'einent of the slide to re verse its direction of movement. Fig. 7 is an enlarged vertical SBCiZlfiIl taken on line Specification of Letters Patent.

E. NOYES, a

A further object the invention resides in the means employed whereby each tooth the shaftlt is a belt wl These and furtherobjeets and novel fea tures of construction are-hereinafter more fully described and claimed and shown ill Patented July'll; 1916.

Application filed December 1, 191a. Serial-No. 504,092.

of Fig. 1 showing the work holding shaft and-mechanism through the medium of which it is, controlled. Fig. 8 is an enlarged viewshowing the path of the gear. tooth in its engagen'lent with the grinding wheel. Fig. 9 is a plan view of tlienieaiis' for adjusting the grinding'wheel shaft longitudinally. Fig. lOis a detail in 'p erspecnism.

Inthe drawings 1 indicates the hollow base or bed of the machine upon which is mounteda slide memberfQ riding in a way 3 on the base. At the forward endof the base is secured the vertically extending head 4. ()n the head i is supported a block 5 riding in ways (i, (3 provided therefor, ad ustable vertically onv the head by means of the screw 7 fixed thereto, which passes through the adjusting nut 8 held in fixed position on the head by tliebracket S). nut 8 is provided with aThaiid-wheel 1() by ive of part of thecluteh operating mecha- The means of which it may be easily rotated.

The. block asis hereinafter more fully described, supports the shaft 11, o'nthe end of which is mounted the grinding wheel 12' preferably provided with a easing l3. (.hi ieel ll driven by. a

belt 15" from the shaft 16 which inturn is driven by theibelt l7'froi i| any convenient source. of power. The shaft lli is oarl'ied' at the upper i-nd' of a bracket 13 pivotally supported at l.) to thehertical heail -l., livoted, to the bracket near the upper end is a rod 2'0 which is also pii otally secured at i, 21 to thebloekfi. .llllh arrmigement enables; the shaft, lilti) bemaintained in substantially its proper relation with the shaft 11 under alteration of. the. position of the shaft ll incident tothe shifting of. the block- 5 on the head 4. I "l heslido member Zisprovided with un;-

able. hearings in which is supported the work supporting shaft 22. upon the outer end of, f

which is supported the toothed blaukBZl-in vertical alinement with the'grinding wheel shaft. flhe gear blank is brought to and from the grinding wheel byreason of the reciprocation of the slide Q Vi'hlUll is produced by meehanism hereinafter described."

The workholding shaft 22 is rotatalily mounted in tlu ybearings PI'OVKlO-(l, and (IS Slllljvl'l) to a rotary ii'ioveijnent imparted thereto in two ways naniely; the niowii'nent on ts axis by means of which the tooth is I i iic made to engage the face of the grinding wheel on the desired eontour line both in approarhing and receding from the grinding wheel mused by the reciprocation ot' the slide, and also the movement on its axis d ning the time the blankis out of engagement with the grinding wheel wherebysaid blank is indexed and a succeeding tooth brought to position to be operated upon during a succeeding forward movement of the slide.

The indexingmeains, which is hereinafter more fully deseribed in detail, inelndcs a worm shaft :23 and worm 2t thereon, which is continuously in engagement with the work wheel rotatahlv mounted on the wink holding, shaft. The worm wheel carries a clutch member 26 upon one side thereoi which may he of any' approved form, but is shown as a cone irietion clutch engaged by the cone 27 splined on the shaft 22. Whenever the clutch 27 is thrown into engage merit with the member Bil during operation of the worm shaft 23, the shaft 22 is ro tated on its axis. The movement oi the shaft 22. by which the path of the gear tooth in its engage ment with the grinding wheel determined, is produced through the medium of a term plet 28 having the same contour as the gear tooth and which engages a finder .251 adjustably secured to the vertical head 4, by means of a bolt 30, as may be more elcarl r seen in Fig. 7.

The templet 28 is held on the arm 31 of the carrying member 32 by a bolt 33. the head of which rides in a T shaped slot illin the arm ill. The radial distance of the templet from the center of the shaft may thus be set to agree exactly with the radius of the pitch eirclc of the gear blank. The teniplet carrier 3". is provided with a clutch member adapted to he engaged by a corresponding member 36 which is preferably formed integrally with the clutch member fl'f heretofore described.

The templet-Eltl is held in engagement with the finder 29 by means of a spring 37 attached to the lower end of the templet incur her and to a convenient part of the framework asfshown in Fig. 5. and as the slide member .2 moves forward toward the grinding wheel. and with the clutch 36 in engagement with the companion 35h the shaft 22 is made to turn in a manner detern'iined by the contour of the tem'plet. The tooth of the blank, therefore, has the identical pathof movement in engagement with the grinding wheelas that of the tcmplet in engag' ing the" finder. As hereinafter shown, the elutclrimember 36 remains in engagement with the companion member 35 during that portion of the forward and backward 1novement of the slide in which the tooth of the blank engages the grinding wheel and the entire face of the tooth 1s thus twiee submemos jected to the grinding action of the grind jog wheel. Therefore whatever form the tooth or the blank may have, it will be grouinl on desired line by the use of a templet of the same form. I am aware of other devices for this purpose in which a work l'iolding shaft is made to'rotate. as the gear tooth is brought into engagement with. the grinding wheel, by means of a tape. but such device rotates the work holding shaft at a predetermined uniform rate,' while with the device here disrlosed the work holding shaft may turn quite rapidly during the initial engagement of the tooth with the grinding wheel, and during the latter part of the engagement therewith the blank may not be pereeptihiy, rotated. thus making a ilat and straight surface below the pitch line oi the tooth. or it may be curved and made to engage the wheel. on a curved line by more rapidly turn-ihg the shaft through the use of a teniplet of the proper form. 4

The movement of the tooth to and from the grimling wheel is indicated somewhat diagrammatically in Fig. 8, showing the tooth of a gear wheel whose center is on the dotted line indie-ding the path on which said center moves by reason of the niovonumt of the slide. In wining into engagement with the grinding wheel, the point of the tooth is the lirst to engage the wheel as shown at o. the next succeeding position is showirbv the dotted lines and'a succeeding and linal position is shown by the dotted lines (a, the center of the gear moving from (/3 to I). and o, and then retreating to a slight distance beyond-rt, as (1; at

which point the work shaft is rotated by the worm wheel to the right from the posi liion shown in Fig. 8 to bring the next succeeding tooth to position to engage the grinding wheel on the next forward movei meat ofthe work-shaft and slide.

The grinding wheel shaft '11. as shown more clearly in Figs. 1. 2 and f) is supported in hearings in a head 38 carried on a block 39 by means of the undercut way portion ill. A screw 41 is in threaded engagement with the bIorl-I ii and provided with a circumlerentiall grooved head 42 which is engaged by a brarlaet -43 seemed to the head 35%. ilv turning the srrew, the head 38 is moved longitudinali of the block 39 which moves the shaft 11. longitudinally and the grinding wheel thus set in proper position for engagement by the gear tooth and enables adjustment to be made as the face of thegri uling wheel wears. The block 39, is secared to the block a by bolts -14. and the block 5 is provided with a ventral raised portion 45 fitting a recess provided in thebloek 39.

@711 secured to the side,

gi inding'surface; v I e i \The machine is operated meansjnofe drive wheel 46 loosely mounted onjthe'she-ft {7 and provided withfajelutch operated by i the member 48 splined onthe shaft and pro- .Videdwith a hand-leveii A9 throughthe me diurn' of. which" the; maehine: m y be thrown, into and out of operation. fv On the shaft 47. is apgear wheel 49 meshing with gear 50 which, as shown more clearlyfin Figs; 5' and G'ismounted on a tdbu'ler hub 51 to Whi'ch is attached one 'memher 52" ofa toothed Jelutch; The gear .150, hill) #51, andwlhtch member 52 support one end of the main operating shaft 53 and hre-"rotetable relatiye the1eto,1the shaft 53 bei ng rotatable only at such time as the clutchfmembei 54 splined on the shaft is brought into engagement mifith the clutch membe1fi525 The: clutch nember 54 is thrown intonendone-oi engagement. with the lcompanionxmember 52 throughoperation of the forked arm 55; 3 which j is produced thronglij the rocking: of

the cross-shaft 56.

As shown more Clearly in Fig. 4]; theshaft 56; extends entirely across-the hed ofthemm chine, ,and projects through on the side 1 thereof upon which erldis inounted'e forked qa'rmf 57, operetive'ly, engaging twoefeoed .eluteh member [58 on ai -shaft 59, hie'hfis molmted in brackets attechedto thesideof' Fig. (E throwsrtheeluteh'fi intoengagement Tlfhe I eross-shelftb56" is froeked and the olutcl1es52end 54: operated through move,

ment of. the slidememherZUZQWhich s ings" the-lever 6l to and fro, upon its. pivot by vreason of, the engagement of the adjilstable vstops62end'63 therew-it Snmy'be' clearly, inferred from. Pg. "1 Tl ielevex 6ljflis piv- :"htedtogthefian e-wogfik 64' meantime -55.,.co1 1neotion with, the l I 65-at-teehed 'to e rock-S 566; earri edfin-e Jheering in the bed bf th machine. Aem'ey be seen more clearly 'Figs. Bend-6; ef.

forked a jm 67 .clependslfriomthe inner end'l C of I the rock-shaft i engaging in e; groove lll 69.

, A and movable longitudinally v thereof, 'llhe shaft is support spririgSf? under tension. it I t I ith on sehmfd 'to; the

115', ing a lnggSS) onthe pe ipheryit hereof whieh is ad llj ed to engage the end of the pewl' l 1 "is 'a., r0el5 arm Fthe influence of the sphingYSi-whieh disenpanion {52;

li k 72, which 1111 edit, is pitbtee to a, rock I shzift '69 and, between the slide member and each block .jrespeeti'vely ereinterposedthe I coiled or"75 nlay-engage and hold the shaft from longitudinal movement until: the pawl isdisengeged As' the slide member 2zrnoves' lever 61 is swung on its pivot makin the sprin s 76 and 77. I Also-piyotitlly@ i mounted on eechbraeketZO and 'ilareithef v 1 pewlsfl'l8end'79 provided withehotoh SQ,

in hotl' instences; behind which the time 74:, t

shafft66 a-nd consequentlymoving the block;

ee ithe'shaft e9 to zthe right 0f the posi- I tioln shm vnin Fig. 6; Thismovement i 'eompre'sses thet spring 76 as theblock {leis held by "the pawl 79 and, consequently, the

movement of the forked erm 67 to thelrigl shaft '69 is held from. movement." The fOl'kQdjL-l'lll'fi? isfprov ided Withtrip armsgslfi and} 82 upon 'enoh side thereof, *zmdf asjtheh L spring 'Tfi to exf and endinwe the bloole and? the slmlftfto th right. The spring 7e bei g;

undereompression zitthis time causes a siid i i t 6 in its bearings, ahdasthe sheft s connected den moyemento'f the shaft longitudinally to th'e roek arm the shaft 556 is rocked;

jupp er I end 1 of which; normally engages the tween the end theifeofairidthelug 86* earr'ied hy the roekerm. v3y1this arrangement the i rockingyofthe shaft 56 toward the rightof integrally formed w I H sliding, clutch member 541m di'slkf'88 hriv 1the fhedflend.receives. its motion through a g with the eompanion 52wvhiehiscontinue 45 gear 60, continuousl i i esh with thej'g'ear ohsly, rotated, asihefo re stated. This, mov ,1110' 29 on the drive-shaftfif J: ment ofv the clutch and forked leven fifi t,

l which is loose on the shefty56, 'pleees thel gagesf'theclutch member witheits ohin-- The main operating sheftf 53""* therefore; Zmalges only one complete revolui-g' tion ateaeh actuation; As before sthtedithef, v shaft also new forked ai'xn fifzittaehedfil a slide 68 loosely Ehiountedmn tl jle shaft thereto; engaging thegtwo faced elutehqnem her 58' the shaft 59"shown moi eel'eerly l in 'Figrflii; 1 When the shaft; 56"is rocked V through QtheQd'esorihed longitudinal move mentf of; the shaft 69'; end the clutch-T thrown into engagement with its compan- 1on, the clutch member 58 is also moved longitudinally on its shaft. but does not eng: ge one companimi member 00" thereof, for the reason that the member must necessarily move a greater distance than the clutchh l. Zlhercfore, the first movement of the roclcshaft caused by the .eon'ipression of the spring causes; the clutch 5+ to engage theaclutch In. and. when said clutch prior to this engagement of the clutch was moving backward away from the grinding wheel.

The slide rcciprocated by the following described iucchanism--'lhe clutches 00 and 91 are loose on the shaft 50 and are formed on or connected with the hubs of the bevel pinions 03 and 03-3 reug'icrtivcly. which are continuously in mesh with the bevel wheel 01 on the shaft 05 carried in a bearing provided in the bed. Thus. while the shaft 50 is continuously rotated through the medium of the gear (30, the gears 92 and 03 are not rotated cxcimt. as the clutch thereon is engaged by the two farcd clutch member 58 splined on the shaftm). the engagement of the clutch 58 with the clutch 0i rotating the bevel wheel 01 in one direction. while engagement of the opposite face of the clutch 3 as with tllccluteh 00 rotates the bevel gear in the opposlte direction.

Loosely mounted on the inner end of the shaft 05 is a gear 90 meshing with an'idler 07 which in turn meshes with a spur gear 08 a t b h ft. 00 secured in the frame of the bed. The gear 98 meshes with a rack 100 on the lower side of the slide member and rotation of the gear 98 in one direction moves the slide forward and reversal (if its direction of rotation moves the slide backward which is accomplished by the operation of the clutch 58. Splincd on the innercnd of the-shaft 95 is a clutch member 101 normally in .en-

'gageinent with its companion clutch on the loosely mounted gear ac.

In order that the slide may be operated by hand and the relative position of the grind ing Wheel and gear blank be accurately determined, the clutch 101 is ope 'ated by the leverlOiZ pivotally supported on the end of the stub shaft 09 and provided with a forked end engaging in a groove in a sliding member 103 on a shaft 101 which extends across the machine as shown in Figs. 1, 3 and 5. The shaft 10-1 is hollow in which is positioned a shifting rod 105 terminating upon the outer face of the machine in a knob 106. The shaft 101 is slotted at 107 in which rides a pin 108 secured to the operating rod 105' and the sliding member 103. By pulling the operating rod outward, the clutch 101 is disengaged from its companion on the gear 96 which isloose on the shaft and the gear 98 may then be actuated through the medium of the gear 109 on the hand operated shaft 91 meshing with the gear 96. The shaft 101 may be operated through the medium of the wheel 110. and this operation by hand does not interfere with the automatic operation of other parts of the mechanism produced through the driving mechanism heretofore described.

Theindexing shaft 23. is operated in the following manner: Supported in bearings PI'OVHIQCl in the bed, and lying parallel to the main operating shaft 53, is a shaft 111 on which is mounted a spur gear 112 meshing with a gear 113 on the main operating shaft 53. The gear 112 is carried on a sleeve which is rotatable relative to the shaft and carried upon one end thereof is one member 114 of a friction clutch whose companion 115 keyed to the shaft. The clutch members are continuously in frictional engagement and the member 115 is normally held from rotation by the rock lever 110 having an end engaging in a notch 117 in the member, as is shown more clearly in Fig. 7. The lever 110 is held in contact with the clutch member by a spring 118 and is secured to the rockshaft 110 supported in hearings on the side of the bed. Near one end the shaft 110 is provided with a trip arm 120 which is engaged once every revolution of the shaft 53, by a roller 121 mounted on the disk 122, which is secured to the main operating shaft 53. The parts are so relatively ar'anged that, as the shaft 53 starts to revolve through operation of the mechanism heretofore described. the trip arm 1% is actuated Which withdraws the end of the lever 116 from the notch 11?, and releases the clutch member 115 to the influence of its companion 11L thereby rotating the shaft 111. V It is to be noted that the gear 113 is considerably larger in diameter than the gear 112 whereby a single rotation of the gear 113 turns the gun 112 more than one revolution, but through the automatic operation of the lever 110, which automatically drops into the notch provided in the clutch member 115,

only a single revolution of the shaft 111 is indexing to be performed within the necessary time limit.

On the outer end of the shaft 111 is a spur gear 123 which meshes with an idler gear 12-1, removably mounted in thebraeket ent sizes are to be operated upon, a gear 124 of the same size and number of teeth as the gear blank, is necessarily utilized to properly index the blank. As gears of various diameters are to be utilized to perform the function of the idler gear 12%1, it is mounted in the pivoted bracket 125 so as to swing toward or from the gear 123' and the gear 126 on the indexing or worm-shaft 23 to I accommodate the change in size. The lever 116 is tipped and the indexing mechanism actuated at a time when the slide 2has withdrawn the blank from engagementwith the grinding wheel. 7 I i The cone clutch 27, utilized to alternately connect the worm-Wheel 25 and the templet carrier 32 with the work-shaft 22, is operated through the medium ofja forked-lever 127, pivoted at 128 to brackets carried by the slide memberv2, the lower end of which extends downward intp the base of the machine terminating in the forked arms 129 and 130, disposed upon opposite sides of the cam disk 131 ,splincd on the shaft Ihe cam disk is movable longitudinally of the shaft by reason of its being interposed between'brackets 132 and 133 attached to the slide and is, therefore, carried in fixed relation with the forked arms 129 and 130, and

the slide 2. The cam disk is provided with cam members 134 and 135 upon opposite faces'thereof as may be seen in Fig. 3, and

contact of the cam 134 with the fork end its companion 26 on the worm wheel. These 1 cams are so arranged and timed to operate that, as the blank is Withdrawn from en gagement with the grinding wheel which is near the finish of'the backward stroke of the slide 2, the worm Wheel is clutched to ,the shaft and the blank indexed, and the a clutch then disengaged from the worm y, wheel and thrown into engagement with the templet carrying member, 'both of these acts being performed during a single revolution of the main operating shaft 53. With the templet carrying member clutched to vthe work-shaft the slide then moves forward presenting the tooth tothe grinding wheel and withdrawing it therefrom in a path ated and controlled in the manner heretofore described.

While I have shown and described a particular form and arrangement of the actuat' ing mechanism by which the workeshafti may be brought into operation in the desired manner and through the mechanism of t WhatI do claim and desire to secure by i Letters Patent of the United States is- 1. In mechanism of the kind described,'a grinding device for operating on the face of a gear tooth, a reoiprocable holder for carrying a toothed blank, means for'reclprocatin the work holderto bring a tooth of the blan 35.

into and out of engagement-with the grinding device, and a templet I carried by the work holder through the medium .of which the path traversed by the tooth during its engagement with the grinding device isdetermined.

2. In mechanism of the kind described, a grinding device for operating on the face of a gear tooth, a holder for carrying atoothed blank, means for moving the holder to bring a tooth of the blank into and out of engagement with the grinding device, and a templet of the same size and contour as a finished gear tooth through'the medium of which the tooth; of the blank engages 'the, driving device in a path having the contour :of a finished gear tooth. v

3. In mechanism ofthe kind described, a

work-holding shaft, a "frame having bearings for the shaft and being movable transversely .of the longitudinal axis thereof, a templet having the contour of a finished gear tooth, grinding means for operating upon 3; gear tooth, and automatic mechanism for recipro-.

eating the said frame to bring the shaft toward and from the grinding means, the templet determining the path of movement of the tooth in engaging the grinding means.

4. In mechanism ofpthe kind described, an axially fixed work-holding member, a temns C plet havingthe same size and contour as a 1 finished gear-tooth carried by said member,

grinding means for operating-upon a gear tooth, automatic mechanism for bringing the work-holding member toward and from the grinding means, a finder with which the templet engages, means wherebythe engagement of the templet with the finder determines the path of movement of the tooth in engaging'the grinding means, andindexing means for. said gear adapted to operate the work-holding member at a time when the, v

gear tooth is out of engagement with the grinding means. P i 5. In mechanism of the kind described, a

rotatable grinding wheel, a holder for toothed blanks, mechanism or reelpmoating the holder to bring, a tooth of the blank into and out of engagement with the grinder, and,

a tcmplethaving, the contour of a finished tooththrongh the medium of WllHll the path of movement of the tooth oi the blank in engaging the grinding: wheel is determined.

(.3. In meehanism oi the kind described,- a grinding; wheel, a shalt for toothed blanks reeiprmzable transversely of its longitudinal ar zis to. bring the blanks to and-from the grinding Wheel, and a ten'iplet radlally adjustable relative to the shalt and having a contour of a finished gear tooth through the medluni oi which the Shatt IS turned and a tooth of the blank made to engage the grind ing wheel in a path having the contour of a finished gear tooth as the shaft mores both to and fromthe grinding Wheel.

T. In mechanism ot the kind described, a

a rotatable grinding Wheel having a 1- raetically flat face held in angularly fixed relation i to the blank to be operated upon.'a holder for toothed blanks "having a reciprocating movement, and means for imparting a varied rotary movement to the holder Whereby aftooth' of theblauk engages the grinding wheel in a path whose- (rontonr isthat ot a finished rear tooth. it i 8. In mechanism of the kind desrribed. a

rotatable grinding wheel angular-1y adjustable relative to the blank to be operated juponand also ad ustable to arcommodate 'lllflllkSIOll v'a'rions pitch diameters, a holder for toothed; blanks, means for mining the holder to andrfrom the 'grinding "wheel, and a templet through the medium of which a tenth of the'blank engages a grinding vWheel em a path having, the contour of a finished gear tooth during both the jl orward and baokwart'l mowgement of the hol der.

J. In mechanism of the kind described, a

rotatable grindingwheel, m ions for adjusting: the angle of the wheel relative to the a i llank to be operated upon, means tor ad nst iag the Wheel to accommodate toothed blanks "continuously rotatable grinding wheel ad lib jnstable to arrmmmodate toothed blanks of various pitch diameters a holder for said blanks, automatic means for moving the holder to'and from the gurirnling wheel, and a templet through the meoilun of which a tooth oil the blank is made to engage the grinding wheel on a path baring the noninoiplia tour of a finished gear tooth, said templet being adjustable to correspond with the adjustment of the grinding 'l1( ?(3l.

11. In mechanism oithe l"nd described, a continuously rotatable grinding Wheel, a holder for toothed blanks, automatically operating means for moving the holder to and from the grinding wheel, manually operahle means rmmoving the holder toand gaging the automatically operating means, and a templet thronglrthe medium of which a tooth ,otth'e blank is made to engage the grinding Wheel in a path havingthe contour, of a finished gear tooth. 1.2.111 mechanism of the kind described, the combination of a rotatable grinder, a holder for toothed blanks, means for moving the holder toward and from the grinder, a 'te nplet carrying member mounted on said holder-ya templet carried thereby, a finder for said templot, the engagement of the templet withwthe finder operating to determine the path of movement of a tooth of" the blank in engaging the grinder, mechanism for rotating the holder to index the blank operating at a time whenthe tooth is out of engagement \rith the grinder, and means for alternately connecting the templet carrying device and the indexing mechanism with the holder.

13. In mechanism of the kind described, a grinding wheel for operating on the face from the grinding wheel, means for disemof a gear tooth, a rotatable work holding; i

shaft movable to brin a tooth of the gear.

blank into and out of engagement with the grinding wheel, a templet-of the same size and having the same contour as the face of a finished gear tooth carried by the Work holding shaft, -said templet being adjustable whereby it may be set a radial distance from the shaft center equalto'the radius of the'piteh circle of the-gear blank to be .operatednpon, said grindingwvheel being adjustable .in position to accommodate gears of various pit-ch diameters, a fixedly positioned finder for said templet, automatically operated means through the medium of which the templet mayturn the worlr he ing shaft during the time a gear tooth is in engagement with the grinding wheeland determine its path of movement vrelative thereto, and alternately operatively connect the indexing means to the shaft at a. time when the tooth is out of engagement with the grinding wheel.

14.- In mechanism of the kind described, a basememberhaving a vertically extend ing head portion, a shaft support vertically adjustable on said head, a shaft rotatably mounted in said support, a grinding wheel carried by said shaft, a slide movable horizontally on said base member, a work holding shaft carried by the slide, a. ter'np'let supporting member loosely mounted on the work holding shaft, a templet carried byv said member of the same size and having the same contour as a finished gear tooth, said templetbeing adjustable on its support whereby it may be set a radial distance from the shaft center equal to the radius oftheipitch circle of the gear blank to be operated upon, a finder for said templet secured to the vertically extending head portion, automatically operated indexing means, a gear loosely mounted on the work holding ,shaft operatively connected with the indexing means and forming a part thereof, and automatic means for securing the .templet carrying member. to thework holding shaft during the time the gear tooth, .is in engagement with the grinding wheel and thereby determine its path .of movement relative thereto, and to alternately release said templet carrying member and see cure the loosely mounted gear to the work holding shaft to turn said shaft and index the gear blank at a time when the blank is out of engagement with the grinding Wheel.

15. In mechanism'of the kind described, a continuously rotatable grinding wheel, an

axially fixed work holding member movable toward and from the grinding wheel, index-' ing means through the medium of which the work holding member vmay beturned to index the blank, a templet member supported by the work holding member, a

templet carried by said member, means adapted to alternatelyoperatively connect the indexing mechanism and the templet' carrying member with the work holding member, a finder forthe templet, a driving means, automatic means connected with the driving means for moving the work holdmg member to and from the grinding through a' path having the contour ofv a finished gear tooth in itsengagement with the grinding wheel, a {main operating shaft,

means operated by movement of the Work holding member to intermittently connect said'main shaft with. the driving means,

means'actuated by said main shaft for operating the means for alternately connecting the indexing, meansand the templet membar with the work-shaft, an indexing'shaft movable to and fro with the work holding dium of, which the workholding shaft is revolved to. index the blank, and, a pivotally mounted bracket for carrying said gear whereby indexing gears of various ,pitch diameters may be utilized.

In testimony whereof, I sign this specification in the presence of two witnesses. arnnwn NOYES.

. Witnesses: I v

A. F.v GAuTwnIeH'r, W. L. VVAorrs 40 wheel, the templet and finder providing a v means whereby a tooth of the blankvmoves 

